• Title, Summary, Keyword: 철도통합무선망

Search Result 5, Processing Time 0.029 seconds

A Study on the Establishment of Redundancy for Stable Operation of Integrated Railway Network (LTE-R) (철도통합무선망(LTE-R)의 안정적인 운영을 위한 이중화 구축 방안 연구)

  • Pyo, Seung-ho
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.2
    • /
    • pp.51-58
    • /
    • 2019
  • The LTE system decided to build an integrated disaster safety communication network in order to cope with disasters quickly after the April 16, 2014 disaster, and 333 agencies in 8 areas will build a unified disaster safety communication network. It plans to integrate LTE-R, a railway integrated wireless network, and LTE-M, a land-based communication network, in the 700MHz band. LTE-R, a wireless integrated network, and the Ministry of Land, Transport and Maritime Affairs, are currently using VHF and TRS, which are voice communication-oriented communication systems, in order to cope with demand for high-speed railway service, With this possible LTE-R, it is possible to provide advanced services such as radio-based train control and improve railway safety. The company plans to invest KRW 1.1 trillion in new routes to be launched in 2018 and the existing route to be improved in the future, and to build up all routes of general and high-speed railways to LTE-R by 2027.

LTE-R LinkBudget Analysis for channels interference in the case of sharing the Integrated Public Network Frequency (통합공공망 주파수 공용 환경에서의 LTE-R 링크버짓 분석)

  • Won, Hong-sun;Kim, Seong-cheol
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.21 no.10
    • /
    • pp.1833-1839
    • /
    • 2017
  • Korea Railway is enhancing the railway wireless communication system from VHF and TRS which have been used for 100 years to LTE-R starting with Ministry of Science and ICT's allocation of Integrated Public Network Frequency on December 2014. LTE-R has advantages on technology performance, also on ease of evolution based on standardization compared to existing technologies. However there are few problems that need to be solved to provide stable railway wireless services in the future. Due to national spectrum policy, LTE-R has frequency interference with Integrated Public Networks (PS-LTE, LTE-M ) and UHD-TV which was commercialized in 2017. This paper introduces performance changes caused by interferences which were founded from the test bed in Wonju~Gangneung LTE-R project and the result of RAN-Sharing. In addition, this paper suggests the standard for LTE-R cell planning in the case of sharing the Integrated Public Network Frequency by analyzing the changes of designed link-budget factor based on the test result.

Implementation plan of eMBMS in the case of LTE-R (철도통합무선망(LTE-R) 환경에서의 eMBMS 구현방안)

  • Park, Min-ju;Won, Hong-sun
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.22 no.6
    • /
    • pp.903-909
    • /
    • 2018
  • In December 2017, the world's first LTE-R for 250km/h high-speed railway was commercialized with the opening of Wonju-Gangneung high-speed railway. LTE-R has many advantages such as voice and video call, high-speed data transmission, coverage redundancy and DU redundancy. But it requires efficient use of radio resources because of a limited bandwidth of 10MHz for UL and DL, respectively. The existing unicast scheme has limited high frequency efficiency so when the number of users increases, service is limited due to the network load, which could be a problem for LTE-R in terms of stability and reliability. On the other hand, the multicast scheme via eMBMS can provide stable service even if the number of video users is high. This paper derives the number of unicast scheme users considering the LTE-R network with LAB test and calculation result, and proposes implementation plans and considerations for eMBMS commercialization on LTE-R.

Proposal of Wireless Communication Method and Candidate Frequency Band for Constructing the Integrated Radio Networks for Railroads (철도통합 무선망 구축을 위한 무선통신방식과 후보주파수대역 제안)

  • Park, Duk-Kyu;Lee, Sang-Yun;Yoon, Byungsik;Kim, Yong-Kyu
    • Journal of the Korean Society for Railway
    • /
    • v.16 no.6
    • /
    • pp.510-518
    • /
    • 2013
  • These days, interest in radio networks for railways has increased both at home and abroad. In response to this trend, not only the existing radio networks which focus on railway control signals but also the next-generation integrated radio network that can send videos and manage mass storage data are actively being investigated. This paper proposes wireless communication methods to establish integrated radio networks for railways. The paper further suggests a candidate frequency band that could be allocated as the frequency band for railways among the frequency bands currently used in Korea. Based on this paper, we can expect that the domestic railroad will operate more efficiently and that security and convenience of the railroad will reach a superior level. In addition, the Korean integrated radio networks for railways, which cope with the changes in the global technology market, will be established.

Bandwidth Requirement Estimation Method for Future Wireless Railway Communication Systems (차세대 철도통합무선망을 위한 주파수 소요량 계산방법)

  • Jeong, Minwoo;Yoon, Hyungoo;Park, Duk-Kyu;Kim, Kyung-Hee;Lee, Sukjin
    • Journal of the Korean Society for Railway
    • /
    • v.16 no.6
    • /
    • pp.540-550
    • /
    • 2013
  • The Future Wireless Railway Communication System(FWRCS) has attracted attention for the various advantages of such a system like efficient management, precise periodicity of operation and speedy travel. Related to it, the area of bandwidth requirement estimation for the FWRCS is being researched actively because there is a great need for accurate bandwidth distribution. In this paper, sophisticated bandwidth requirement estimation method for FWRCS is proposed by modifying ITU-R M.1390. With this method, the expected frequency requirements for the present, for five years from now, and for 10 years from now can be calculated by applying the data gathered from the actual field.